Color-Coded Bacteria Identification

We identify invisible bacteria by making them change color. In the lab, we use special tests

to see what they can do. If a bacteria ferments sugar, it can turn a tube

bright yellow. Some even produce gas that cracks the media. A positive urea

test creates this insane hot pink color. On certain plates, lactose-fermenting

bacteria grow as vibrant pink colonies. Even the classic Gram stain separates them into purple

or pink groups based on their cell walls. Each color tells a story, helping us figure

out what microbe is causing an infection and how to fight it.